Aeration unit



FIG. 1 is a front elevational view of an aeration unit showing my newdesign, the rear being a mirror image of that shown;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a right side elevational view thereof, the left side being amirror image of that shown.

The ornamental design for an aeration unit, as shown and described.